mirror of
https://github.com/Ryujinx/GtkSharp.git
synced 2024-07-01 18:46:03 +02:00
Reworked the event system. Added partial Button and Label classes. Notes added asking many important questions.
svn path=/trunk/gtk-sharp/; revision=858
This commit is contained in:
Bob Smith
parent
141acf001c
commit
c2d90eb282
30
NOTES
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30
NOTES
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Mike,
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We have some problems. Some methods are going to return a gtk widget which
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will need to be wrapped again into a c# class. This will have a nasty
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reaction when callbacks are added to the wrapper, then the wrapper is nuked
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when complete. It will leave a rogue pointer of some kind laying around, and
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callbacks won't work as expected.
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Proposed solution:
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Every GTK# class is a wrapper class. With a constructor for a GtkWidget* and
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one for a default _new. Events are done as in CVS, except that the events
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object will need to be bound to the GtkWidget owning it, and when a wrapper
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is created, that Events object is resurected. This way, even if there is no
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wrapper in existance, signals will function properly, and multiple wrappers
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will work properly too. The event object will register a delete signal with
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the widget so that when its nuked, it has a chance to free itself. Are we
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going to have to tell the garbage collector to stay away from this class?
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We might need our own class for this, and this class might not be able to be
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written in c#.
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Problem number two is with taking an arbitrary GtkWidget, and constructing a
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wrapper as needed. Which wrapper is created? A simple GtkWidget wouldnt work
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too well if the GtkWidget is really a button. We need to deside how to
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handle this. Should we just return a GtkWidget, and force the developer to
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pass the GtkWidget back to a constructor for the desided apon Widget wrapper?
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How does gtk itself deal with this? Are we going to need a database of
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widget wrappers for this?
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Bob
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70
gtk/Button.cs
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70
gtk/Button.cs
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// GTK.Button.cs - GTK Button class implementation
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//
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// Author: Bob Smith <bob@thestuff.net>
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//
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// (c) 2001 Bob Smith
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namespace GTK {
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using System;
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using System.Runtime.InteropServices;
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public class Button : Widget {
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private static readonly object ClickedEvent = new object ();
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public event EventHandler Clicked
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{
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add
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{
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if (Events[ClickedEvent] == null)
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{
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ConnectSignal ("clicked", new SimpleCallback (EmitDeleteEvent));
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}
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Events.AddHandler (ClickedEvent, value);
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}
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remove
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{
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Events.RemoveHandler (ClickedEvent, value);
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}
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}
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private void EmitClickedEvent (IntPtr obj)
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{
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EventHandler eh = (EventHandler)(_events[ClickedEvent]);
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if (eh != null)
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{
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EventArgs args = new EventArgs ();
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eh(this, args);
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}
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}
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/// <summary>
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/// Button Object Constructor
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/// </summary>
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///
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/// <remarks>
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/// Constructs a Button Wrapper.
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/// </remarks>
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public Button (IntPtr o)
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{
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Object = o;
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}
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/// <summary>
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/// Button Constructor
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/// </summary>
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///
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/// <remarks>
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/// Constructs a new Button with the specified content.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern IntPtr gtk_label_new_with_label (String str);
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public Button (String str)
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{
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Object = gtk_button_new_with_label (str);
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}
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}
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}
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240
gtk/Label.cs
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240
gtk/Label.cs
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// GTK.Label.cs - GTK Label class implementation
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//
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// Author: Bob Smith <bob@thestuff.net>
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//
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// (c) 2001 Bob Smith
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namespace GTK {
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using System;
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using System.Runtime.InteropServices;
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public class Label : Widget {
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/// <summary>
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/// Label Object Constructor
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/// </summary>
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///
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/// <remarks>
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/// Constructs a Label Wrapper.
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/// </remarks>
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public Label (IntPtr o)
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{
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Object = o;
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}
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/// <summary>
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/// Label Constructor
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/// </summary>
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///
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/// <remarks>
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/// Constructs a new Label with the specified content.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern IntPtr gtk_label_new (String str);
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public Label (String str)
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{
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Object = gtk_label_new (str);
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}
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/// <summary>
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/// Text Property
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/// </summary>
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///
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/// <remarks>
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/// The raw text of the label.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern void gtk_label_set_text (IntPtr hnd, const String str);
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[DllImport("gtk-1.3")]
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static extern String gtk_label_get_text (IntPtr hnd);
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public String Text {
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get
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{
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return gtk_label_get_text (Object);
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}
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set
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{
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gtk_label_set_text (Object, value);
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}
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}
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/// <summary>
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/// Markup Property
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/// </summary>
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///
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/// <remarks>
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/// Text to parse.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern void gtk_label_set_markup (IntPtr hnd, const String str);
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public String Markup {
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set
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{
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gtk_label_set_markup (Object, value);
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}
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}
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/// <summary>
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/// Label Property
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/// </summary>
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///
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/// <remarks>
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/// Parsed content.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern void gtk_label_set_label (IntPtr hnd, const String str);
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[DllImport("gtk-1.3")]
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static extern String gtk_label_get_label (IntPtr hnd);
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public String Label {
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get
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{
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return gtk_label_get_label (Object);
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}
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set
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{
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gtk_label_set_label (Object, value);
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}
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}
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/// <summary>
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/// Selectable Property
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/// </summary>
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///
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/// <remarks>
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/// Is the user able to select text from the label.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern void gtk_label_set_selectable (IntPtr hnd, bool setting);
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[DllImport("gtk-1.3")]
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static extern bool gtk_label_get_selectable (IntPtr hnd);
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public bool Selectable {
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get
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{
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return gtk_label_get_selectable (Object);
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}
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set
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{
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gtk_label_set_selectable (Object, value, value);
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}
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}
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/// <summary>
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/// UseUnderline Property
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/// </summary>
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///
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/// <remarks>
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/// Indicates that the next character after an underline should be the accelerator key.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern void gtk_label_set_use_underline (IntPtr hnd, bool setting);
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[DllImport("gtk-1.3")]
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static extern bool gtk_label_get_use_underline (IntPtr hnd);
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public bool UseUnderline {
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get
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{
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return gtk_label_get_use_underline (Object);
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}
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set
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{
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gtk_label_set_use_underline (Object, value, value);
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}
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}
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/// <summary>
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/// UseMarkup Property
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/// </summary>
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///
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/// <remarks>
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/// Indicates that the text contains markup.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern void gtk_label_set_use_markup (IntPtr hnd, bool setting);
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[DllImport("gtk-1.3")]
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static extern bool gtk_label_get_use_markup (IntPtr hnd);
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public bool UseMarkup {
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get
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{
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return gtk_label_get_use_markup (Object);
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}
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set
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{
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gtk_label_set_use_markup (Object, value, value);
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}
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}
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/// <summary>
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/// LineWrap Property
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/// </summary>
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///
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/// <remarks>
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/// Indicates that the text is automatically wrapped if to long.
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/// </remarks>
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[DllImport("gtk-1.3")]
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static extern void gtk_label_set_line_wrap (IntPtr hnd, bool setting);
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[DllImport("gtk-1.3")]
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static extern bool gtk_label_get_line_wrap (IntPtr hnd);
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public bool LineWrap {
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get
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{
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return gtk_label_get_line_wrap (Object);
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}
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set
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{
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gtk_label_set_line_wrap (Object, value, value);
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}
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}
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/*
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TODO:
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void gtk_label_set_attributes(GtkLabel *label, PangoAttrList *attrs);
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void gtk_label_set_markup_with_mnemonic(GtkLabel *label, const gchar *str);
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void gtk_label_set_pattern(GtkLabel *label, const gchar *pattern);
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void gtk_label_set_justify(GtkLabel *label, GtkJustification jtype);
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guint gtk_label_parse_uline(GtkLabel *label, const gchar *string);
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void gtk_label_get_layout_offsets (GtkLabel *label,
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gint *x,
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gint *y);
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guint gtk_label_get_mnemonic_keyval (GtkLabel *label);
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GtkWidget* gtk_label_new_with_mnemonic (const char *str);
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void gtk_label_select_region (GtkLabel *label,
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gint start_offset,
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gint end_offset);
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void gtk_label_set_mnemonic_widget (GtkLabel *label,
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GtkWidget *widget);
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void gtk_label_set_text_with_mnemonic
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(GtkLabel *label,
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const gchar *str);
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PangoAttrList* gtk_label_get_attributes (GtkLabel *label);
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GtkJustification gtk_label_get_justify (GtkLabel *label);
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PangoLayout* gtk_label_get_layout (GtkLabel *label);
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GtkWidget* gtk_label_get_mnemonic_widget (GtkLabel *label);
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gboolean gtk_label_get_selection_bounds (GtkLabel *label,
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gint *start,
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gint *end);
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*/
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}
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}
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@ -11,8 +11,30 @@ namespace GTK {
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using System.Runtime.InteropServices;
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public abstract class Object {
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private EventHandlerList _events;
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protected EventHandlerList Events
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{
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get
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{
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if (_events != null) return _events;
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_events = new EventHandlerList ();
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}
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}
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protected IntPtr obj;
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private IntPtr _obj;
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IntPtr Object
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{
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get
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{
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return _obj;
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}
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set
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{
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_events = null;
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_obj = value;
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}
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}
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protected delegate void SimpleCallback (IntPtr obj);
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@ -11,32 +11,6 @@ namespace GTK {
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public abstract class Widget : Object {
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/// <summary>
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/// ConnectEvents method
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/// </summary>
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///
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/// <remarks>
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/// Connects event handlers to the wrapped GTK widget.
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/// It is not possible to perform this connection in a
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/// constructor, since the leaf class constructor in which
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/// the wrapped object is created is not executed until
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/// after the base class' constructor.
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/// </remarks>
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protected void PrepareEvents ()
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{
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ConnectSignal ("delete-event",
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new SimpleCallback (EmitDeleteEvent));
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}
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private void EmitDeleteEvent (IntPtr obj)
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{
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if (Delete != null) {
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EventArgs args = new EventArgs ();
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Delete (this, args);
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}
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}
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/// <summary>
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/// Delete Event
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/// </summary>
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@ -46,7 +20,33 @@ namespace GTK {
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/// manager.
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/// </remarks>
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public event EventHandler Delete;
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private static readonly object DeleteEvent = new object ();
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public event EventHandler Delete
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{
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add
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{
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if (Events[DeleteEvent] == null)
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{
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ConnectSignal ("delete-event", new SimpleCallback (EmitDeleteEvent));
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}
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Events.AddHandler (DeleteEvent, value);
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}
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remove
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{
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Events.RemoveHandler (DeleteEvent, value);
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}
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}
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private void EmitDeleteEvent (IntPtr obj)
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{
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EventHandler eh = (EventHandler)(_events[DeleteEvent]);
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if (eh != null)
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{
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EventArgs args = new EventArgs ();
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eh(this, args);
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}
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}
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/// <summary>
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/// Show Method
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@ -17,6 +17,19 @@ namespace GTK {
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public class Window : Widget {
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/// <summary>
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/// Window Object Constructor
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/// </summary>
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///
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/// <remarks>
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/// Constructs a Window Wrapper.
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/// </remarks>
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public Window (IntPtr o)
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{
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Object = o;
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}
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/// <summary>
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/// Window Constructor
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/// </summary>
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@ -30,8 +43,7 @@ namespace GTK {
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public Window ()
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{
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obj = gtk_window_new (WindowType.TopLevel);
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base.PrepareEvents ();
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Object = gtk_window_new (WindowType.TopLevel);
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}
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/// <summary>
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@ -155,7 +167,7 @@ namespace GTK {
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public String Title {
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set
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{
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gtk_window_set_title (obj, value);
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gtk_window_set_title (Object, value);
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}
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}
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}
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Block a user